<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <!-- 页面先要引入 Vue.js -->
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="app">
    <p>{{message}}</p>
</div>
<script>
        let app = new Vue({
            el : '#app',                // 针对页面 id 为 app 的元素，支持多种选择器
            data : {
                message : '你好美'
            }
        });
    </script>
</body>
</html>
